<template>
  <div :id="id"/>
</template>

<script>
  // deps for editor
  import 'codemirror/lib/codemirror.css' // codemirror
  import 'tui-editor/dist/tui-editor.css' // editor ui
  import 'tui-editor/dist/tui-editor-contents.css' // editor content
  import Editor from 'tui-editor'
  import defaultOptions from './defaultOptions'

  export default {
    name: 'MarddownEditor',
    props: {
      value: {
        type: String,
        default: ''
      },
      id: {
        type: String,
        required: false,
        default() {
          return 'markdown-editor-' + +new Date() + ((Math.random() * 1000).toFixed(0) + '')
        }
      },
      options: {
        type: Object,
        default() {
          return defaultOptions
        }
      },
      mode: {
        type: String,
        default: 'markdown'
      },
      height: {
        type: String,
        required: false,
        default: '300px'
      },
      language: {
        type: String,
        required: false,
        default: 'en_US' // https://github.com/nhnent/tui.editor/tree/master/src/js/langs
      }
    },
    data() {
      return {
        editor: null
      }
    },
    computed: {
      editorOptions() {
        const options = Object.assign({}, defaultOptions, this.options);
        options.initialEditType = this.mode;
        options.height = this.height;
        options.language = this.language;
        return options
      }
    },
    watch: {
      value(newValue, preValue) {
        if (newValue !== preValue && newValue !== this.editor.getValue()) {
          this.editor.setValue(newValue)
        }
      },
      language(val) {
        this.destroyEditor();
        this.initEditor()
      },
      height(newValue) {
        this.editor.height(newValue)
      },
      mode(newValue) {
        this.editor.changeMode(newValue)
      }
    },
    mounted() {
      this.initEditor()
    },
    destroyed() {
      this.destroyEditor()
    },
    methods: {
      initEditor() {
        this.editor = new Editor({
          el: document.getElementById(this.id),
          ...this.editorOptions
        });
        if (this.value) {
          this.editor.setValue(this.value)
        }
        this.editor.on('change', () => {
          this.$emit('input', this.editor.getValue())
        })
      },
      destroyEditor() {
        if (!this.editor) return;
        this.editor.off('change');
        this.editor.remove()
      },
      setValue(value) {
        this.editor.setValue(value)
      },
      getValue() {
        return this.editor.getValue()
      },
      setHtml(value) {
        this.editor.setHtml(value)
      },
      getHtml() {
        return this.editor.getHtml()
      }
    }
  }
</script>
